No result of the query

Hello, my name is Sofya
I was trying to run an example from this link on Visual Studio Code:
https://codeql.github.com/docs/codeql-language-guides/analyzing-data-flow-in-javascript-and-typescript/#analyzing-data-flow-in-javascript-and-typescript
I created a database of Node.js library manually and added it to Visual Studio Code and it is activated.
My query look like that:

/**
* @kind path-problem
*/

import javascript
import DataFlow::PathGraph

class CommandLineFileNameConfiguration extends TaintTracking::Configuration {
CommandLineFileNameConfiguration() { this = "CommandLineFileNameConfiguration" }

override predicate isSource(DataFlow::Node source) {
DataFlow::globalVarRef("process").getAPropertyRead("argv").getAPropertyRead() = source
}

override predicate isSink(DataFlow::Node sink) {
DataFlow::moduleMember("fs", "readFile").getACall().getArgument(0) = sink
}
}

from CommandLineFileNameConfiguration cfg, DataFlow::Node source, DataFlow::Node sink
where cfg.hasFlow(source, sink)
select sink, source, sink, ""

Unfortunately this query is not giving any results. (no errors occured)
Can you help me with it please? Maybe the problem is in database?

Inizia con la guida di CodeQL sul flusso dei dati indicata nel link, quindi confronta i predicati di origine e sink della query con il database Node.js creato manualmente in Visual Studio Code. Verifica se il database contiene il flusso di process.argv e fs.readFile a cui si fa riferimento. Il lavoro è completato quando viene spiegato perché non compaiono risultati oppure viene identificata la discrepanza tra il database e la query.

Scritto dal modello di indicizzazione a partire dal testo della issue.